Java 计算器 四则运算 简单计算器
Java 计算器 四则运算 超级简单的计算器
[co de]
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
/**
*
* @author Kevin125
*/
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class Kevin extends JFrame implements ActionListener
{
Container contentPane;
Panel panel;
JTextField tf;
JPanel xp;
JButton btnclose;
JPanel cp;
JButton btn7;
JButton btn8;
JButton btn9;
JButton btndiv;
JButton btn4;
JButton btn5;
JButton btn6;
JButton btnmuti;
JButton btn1;
JButton btn2;
JButton btn3;
JButton btnminu;
JButton btn0;
JButton btndot;
JButton btnclear;
JButton btnplu;
JButton btnequ;
StringBuffer temp;
double result=0;
Kevin(String str)
{
super(str);
setBounds(100,200,200,100);
setSize(360,220);
setVisible(true);
setResizable(false);
contentPane=this.getContentPane();
panel=new Panel();
GridLayout grid2=new GridLayout(1,2);
panel.setLayout(grid2);
tf=new JTextField(12);
tf.setHorizontalAlignment(JTextField.RIGHT);
tf.addActionListener(this);
panel.add(tf);
xp=new JPanel();
btnclose=new JButton("关闭");
btnclose.addActionListener(this);
btnclear=new JButton("Clear");
btnclear.addActionListener(this);
xp.add(btnclear);
xp.add(btnclose);
panel.add(xp);
contentPane.add(panel,BorderLayout.NORTH);
cp=new JPanel();
GridLayout grid=new GridLayout(5,5);
cp.setLayout(grid);
btn7=new JButton("7");
btn7.addActionListener(this);
cp.add(btn7);
btn8=new JButton("8");
btn8.addActionListener(this);
cp.add(btn8);
btn9=new JButton("9");
btn9.addActionListener(this);
cp.add(btn9);
btndiv=new JButton("/");
btndiv.addActionListener(this);
cp.add(btndiv);
btn4=new JButton("4");
btn4.addActionListener(this);
cp.add(btn4);
btn5=new JButton("5");
btn5.addActionListener(this);
cp.add(btn5);
btn6=new JButton("6");
btn6.addActionListener(this);
cp.add(btn6);
btnmuti=new JButton("*");
btnmuti.addActionListener(this);
cp.add(btnmuti);
btn1=new JButton("1");
btn1.addActionListener(this);
cp.add(btn1);
btn2=new JButton("2");
btn2.addActionListener(this);
cp.add(btn2);
btn3=new JButton("3");
btn3.addActionListener(this);
cp.add(btn3);
btnminu=new JButton("-");
btnminu.addActionListener(this);
cp.add(btnminu);
btn0=new JButton("0");
btn0.addActionListener(this);
cp.add(btn0);
btndot=new JButton(".");
btndot.addActionListener(this);
cp.add(btndot);
btnequ=new JButton("=");
btnequ.addActionListener(this);
cp.add(btnequ);
btnplu=new JButton("+");
btnplu.addActionListener(this);
cp.add(btnplu);
cp.validate();
contentPane.add(cp,BorderLayout.CENTER);
contentPane.validate();
validate();
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
temp=new StringBuffer("");
}
public void actionPerformed(ActionEvent e)
{
try{
if(e.getSource()==btnclose)
{
System.exit(0);
}
else if(e.getSource()==btn7)
{
temp.append(btn7.getText());
String str1=temp.toString();
tf.setText(str1);
}
else if(e.getSource()==btn8)
{
temp.append(btn8.getText());
String str2=temp.toString();
tf.setText(str2);
}
else if(e.getSource()==btn9)
{
temp.append(btn9.getText());
String str3=temp.toString();
tf.setText(str3);
}
else if(e.getSource()==btndiv)
{
temp.append(btndiv.getText());
String str4=temp.toString();
tf.setText(str4);
}
else if(e.getSource()==btn4)
{
temp.append(btn4.getText());
String str6=temp.toString();
tf.setText(str6);
}
else if(e.getSource()==btn5)
{
temp.append(btn5.getText());
String str7=temp.toString();
tf.setText(str7);
}
else if(e.getSource()==btn6)
{
temp.append(btn6.getText());
String str8=temp.toString();
tf.setText(str8);
}
else if(e.getSource()==btnmuti)
{
temp.append(btnmuti.getText());
String str9=temp.toString();
tf.setText(str9);
}
else if(e.getSource()==btn1)
{
temp.append(btn1.getText());
String str11=temp.toString();
tf.setText(str11);
}
else if(e.getSource()==btn2)
{
temp.append(btn2.getText());
String str12=temp.toString();
tf.setText(str12);
}
else if(e.getSource()==btn3)
{
temp.append(btn3.getText());
String str13=temp.toString();
tf.setText(str13);
}
else if(e.getSource()==btnminu)
{
temp.append(btnminu.getText());
String str14=temp.toString();
tf.setText(str14);
}
else if(e.getSource()==btn0)
{
temp.append(btn0.getText());
String str16=temp.toString();
tf.setText(str16);
}
else if(e.getSource()==btndot)
{
temp.append(btndot.getText());
String str17=temp.toString();
tf.setText(str17);
}
else if(e.getSource()==btnclear)
{
temp.delete(0,temp.length());
tf.setText("0.0");
}
else if(e.getSource()==btnplu)
{
temp.append(btnplu.getText());
String str19=temp.toString();
tf.setText(str19);
}
else if(e.getSource()==btnequ)
{
String str=temp.toString();
char[] c=str.toCharArray();
temp.delete(0,temp.length());
int len=c.length;
for(int i=0;i<8;i++)
{
if(c[i]=='+')
{
double temp1=Double.parseDouble(str.substring(0,i));
double temp2=Double.parseDouble(str.substring(i+1,len));
result=temp1+temp2;
temp.append(String.valueOf(result));
tf.setText(temp.toString());
break;
}
if(c[i]=='-')
{
double temp1=Double.parseDouble(str.substring(0,i));
double temp2=Double.parseDouble(str.substring(i+1,len));
result=temp1-temp2;
temp.append(String.valueOf(result));
tf.setText(temp.toString());
break;
}
if(c[i]=='*')
{
double temp1=Double.parseDouble(str.substring(0,i));
double temp2=Double.parseDouble(str.substring(i+1,len));
result=temp1*temp2;
temp.append(String.valueOf(result));
tf.setText(temp.toString());
break;
}
if(c[i]=='/')
{
double temp1=Double.parseDouble(str.substring(0,i));
double temp2=Double.parseDouble(str.substring(i+1,len));
if(temp2!=0)
{
result=temp1/temp2;
temp.append(String.valueOf(result));
tf.setText(temp.toString());
break;
}
else
{
tf.setText("除数为零,请重新输入!");
}
}
}
}
}catch(Exception ee)
{
tf.setText("ERROR");
}
}
}
public class NewCalc
{
public static void main(String[] args)
{
Kevin k=new Kevin("计算器");
}
}
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